Applications Guide Tracer Graphical Programming - Trane

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® Chapter 8 Constant-volume AHU with warm-up, pre-cool, and communications Adding the pre-cool and warm-up decisions The heat/cool mode and night heat/cool decisions are the same as those in Chapter 7. See “Adding night heat/cool” on page 184 for more information. However, the mode and setpoints program must incorporate additional decisions to accommodate pre-cool and warm-up modes. These decisions arespecifiedinthesequenceofoperationandsummarizedhere: Enter pre-cool when all of the following are true: • The unit is occupied (including occupied, occupied standby, and occupied bypass modes). • The unit is in cooling mode. • The space temperature is at least 3°F above the effective cooling setpoint. Exit pre-cool mode when the space temperature falls to within 2°F of the effective cooling setpoint. Enter warm-up mode when all of the following are true: • The unit is occupied (including occupied, occupied standby, and occupied bypass modes). • The unit is in heating mode. • The space temperature is at least 3°F below the effective heating setpoint. Exit warm-up mode when the space temperature rises to within 2°F of the effective heating setpoint. Implement these decisions in graphical programming using the night heat/cool decision as a model. Note that you must base the decision for each mode on a value that is offset by 3°F from the effective cooling and heating setpoints (Figure 176 on page 215). • Use Add and Subtract blocks to calculate the setpoints for each Deadband block. • Configure the Deadband block for pre-cool as greater than, but configure the Deadband block for warm-up as less than. 214 CNT-APG001-EN
® Writing the mode and setpoints program Figure 176: Pre-cool and warm-up decisions Figure 177: Completed modes and setpoints program Offset calculation After completing the changes to the mode and setpoints program (Figure 177), compile and download the program to the controller. CNT-APG001-EN 215
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Applications Guide Tracer Graphical
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CNT-APG001-EN ®
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® Contents Chapter 5 Cooling tower
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® Contents Chapter7 Constant-volum
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® Contents Summary-question answer
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Applications Guide Tracer Graphical Programming - Trane

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